5.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Haoxiang Li <haoxiang_li2024@xxxxxxx>
[ Upstream commit 860ca5e50f73c2a1cef7eefc9d39d04e275417f7 ]
Add check for the return value of cifs_buf_get() and cifs_small_buf_get()
in receive_encrypted_standard() to prevent null pointer dereference.
Fixes: eec04ea11969 ("smb: client: fix OOB in receive_encrypted_standard()")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Haoxiang Li <haoxiang_li2024@xxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/cifs/smb2ops.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 68f93de2b1527..70a4d101b5428 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -4938,6 +4938,10 @@ receive_encrypted_standard(struct TCP_Server_Info *server,
next_buffer = (char *)cifs_buf_get();
else
next_buffer = (char *)cifs_small_buf_get();
+ if (!next_buffer) {
+ cifs_server_dbg(VFS, "No memory for (large) SMB response\n");
+ return -1;
+ }
memcpy(next_buffer, buf + next_cmd, pdu_length - next_cmd);
}
--
2.39.5
